题目内容

In the literature search, which set of keywords can quickly retrieve the reference literature on the design theory of light-steel structure factory?

A. steel structure factory, design theory
B. factory, design theory
C. portal frame, concrete
D. factory, design

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Which of the following references citation is in accordance with China's standard of reference citation?

A. [1] Ngian, S.P., Tahir, M.M., Sulaiman, A. et al. Wind-moment design of semi-rigid un-braced steel frames using cruciform column (CCUB) section. Int J Steel Struct 15, 115–124 (2015).
B. [1] Ngian, S.P., Tahir, M.M., Sulaiman, A. et al. Wind-moment design of semi-rigid un-braced steel frames using cruciform column (CCUB) section[J]. Int J Steel Struct 15, 115–124 (2015).
C. [1] Ngian, S.P., Tahir, M.M., Sulaiman, A. et al. Wind-moment design of semi-rigid un-braced steel frames using cruciform column (CCUB) section[J]. Int J Steel Struct 2015, 15, 115–124.
D. [1] Ngian, S.P., Tahir, M.M., Sulaiman, A. et al. Wind-moment design of semi-rigid un-braced steel frames using cruciform column (CCUB) section[J]. Int J Steel Struct 2015, 15: 115–124.

形成神经和骨骼肌细胞静息电位的主要离子是

A. K+
B. Na+
Ca2+
D. H+

触发运动神经末梢释放神经递质的因素是

A. K+
B. Na+
Ca2+
D. H+

在动作电位的绝对不应期

A. 兴奋性最大
B. 兴奋性低于正常
C. 兴奋性高于正常
D. 兴奋性为零

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